In August 2024, a solver known as "SudoKai" posted a verified solve of The Guardian’s "Deadly" Sudoku (Level 129 in their seasonal series) in exactly 129 seconds. The puzzle was later nicknamed the "Sudoku 129 Challenge."
At first glance, "129" seems like a random number. It is not a standard grid size (like 6x6 or 16x16), nor is it a classic difficulty rating. So, what exactly is Sudoku 129? Depending on the context, this keyword can point to three distinct phenomena: a specific mathematical constraint within Killer Sudoku, a level number in a popular mobile app, or a high-score target for speed solvers. sudoku 129
While many enjoy a casual game, the competitive scene is intense. The world record for the fastest completion of a "Very Easy" puzzle is roughly , held by Thomas Snyder . On the other end of the spectrum, mathematicians like Arto Inkala have spent months designing "world's hardest" puzzles that require dozens of logical steps for a single digit placement. In August 2024, a solver known as "SudoKai"